1 files changed, 69 insertions, 0 deletions
diff --git a/src/banman.h b/src/banman.h
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+++ b/src/banman.h
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+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2017 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+#ifndef BITCOIN_BANMAN_H
+#define BITCOIN_BANMAN_H
+
+#include <cstdint>
+#include <memory>
+
+#include <addrdb.h>
+#include <fs.h>
+#include <sync.h>
+
+// NOTE: When adjusting this, update rpcnet:setban's help ("24h")
+static constexpr unsigned int DEFAULT_MISBEHAVING_BANTIME = 60 * 60 * 24; // Default 24-hour ban
+
+class CClientUIInterface;
+class CNetAddr;
+class CSubNet;
+
+// Denial-of-service detection/prevention
+// The idea is to detect peers that are behaving
+// badly and disconnect/ban them, but do it in a
+// one-coding-mistake-won't-shatter-the-entire-network
+// way.
+// IMPORTANT:  There should be nothing I can give a
+// node that it will forward on that will make that
+// node's peers drop it. If there is, an attacker
+// can isolate a node and/or try to split the network.
+// Dropping a node for sending stuff that is invalid
+// now but might be valid in a later version is also
+// dangerous, because it can cause a network split
+// between nodes running old code and nodes running
+// new code.
+
+class BanMan
+{
+public:
+    ~BanMan();
+    BanMan(fs::path ban_file, CClientUIInterface* client_interface, int64_t default_ban_time);
+    void Ban(const CNetAddr& net_addr, const BanReason& ban_reason, int64_t ban_time_offset = 0, bool since_unix_epoch = false);
+    void Ban(const CSubNet& sub_net, const BanReason& ban_reason, int64_t ban_time_offset = 0, bool since_unix_epoch = false);
+    void ClearBanned();
+    bool IsBanned(CNetAddr net_addr);
+    bool IsBanned(CSubNet sub_net);
+    bool Unban(const CNetAddr& net_addr);
+    bool Unban(const CSubNet& sub_net);
+    void GetBanned(banmap_t& banmap);
+    void DumpBanlist();
+
+private:
+    void SetBanned(const banmap_t& banmap);
+    bool BannedSetIsDirty();
+    //!set the "dirty" flag for the banlist
+    void SetBannedSetDirty(bool dirty = true);
+    //!clean unused entries (if bantime has expired)
+    void SweepBanned();
+
+    CCriticalSection m_cs_banned;
+    banmap_t m_banned GUARDED_BY(m_cs_banned);
+    bool m_is_dirty GUARDED_BY(m_cs_banned);
+    CClientUIInterface* m_client_interface = nullptr;
+    CBanDB m_ban_db;
+    const int64_t m_default_ban_time;
+};
+
+extern std::unique_ptr<BanMan> g_banman;
+#endif